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Brockhaus-1911: Frith [2] · Frith
Herder-1854: Solway-Frith
Meyers-1905: Frith, William Powell · Frith
Pierer-1857: Frith [2] · Pentland-Frith · Solway-Frith · Chapel in the Frith · Frith of Clyde · Frith [1]